When using the perfect tenses of verbs, it's necessary to add a/an A. irregular verb. B. infinitive. C. helping verb. D. suffix.

Respuesta :

When using the perfect tenses of verbs, it's necessary to add a helping verb,  The answer is letter C.  Helping verbs helps in conjunction to connect it with a mood or time of the verb. The examples of helping verb are will, shall, may, might, can, could, and must.